Duplicator



Feb. 5, 1929. 1,701,431

E. VAN EERDE DUPLICATOR fnmw i E' erf Tfn-n Eer-ae INVENTOR WITNESS:

ATTORNEY Patented Feb. 5, 1929.

UNITED STATES PATENT oFFicE.

EGBERT VAN EERDE, 0F NEW YORK, N. Y.

DUrLIcAToR.

Application led March 7, 1927. Serial No. 173,540.

This invention relates to the art of producing manifold copies by transferring the matter to be copied from an ordinary sheetr periments have shown kthat a container made ,f

of wood will buckle and warp and affect the transfer surface, and will in addition, rapidly absorb the moisture from the clay, so that the latter will quickly dry rand break away from the bottom and sides of the container. A container of metal will quickly rust and Corrode and the clay will rapidly dry out and lose its shape, so that the trans-v .fer surface will be ruined.

The present invention overcomes the above and other disadvantages by forming the bottom of the clay container of slate, this mate rial being free from the disadvantages above mentioned.

The invention further provides a container arranged to form a guideor gage, whereby the transfer surface of the clay may be accurately renewed with a minimum amount of loss of time, labor and material.

Vith the above and other objects in view, the invention further includes thefollowing novel features and details of construction, to be hereinafter more fully described, illustrated in the accoinpan ing drawings and pointed out in the appen ed claim.k

In the drawings:

Figure 1 is a plan view of ther invention vwith the cover removed. c

Figure 2 is a longitudinal sectional view.

Figure 3 is a planfview with the cover in place and partly broken away.

Referring to the drawings in detail wherein like characters ofy reference Adenote corresponding parts, the reference-character 10 indicates a holder or container which may be of any suitable construction that includes a slate bottom l11 anda frame 12. For the purpose of illustration, this slate bottom may be set into Vthelfi'ame as shown Vat 13 and the latter may be formed of wood and eX- tend only a slight distance upward. Av shallow tray isthus provided to receive a thin layer of clay indicated at 14. The upper face of this clay forms the transfer surface fromv which a number of duplicates vof an original may be made. The Vclay is preferably of the character commonly known modeling clay and its surface is prefer.- ably covered with a thin layer of glycerine. The glycerine is absorbed by the clay'and keeps the latter in a plasticor seiniplastic condition andv provides a thfin transfer film i upon the transfer surface mentioned. Y By means ofthe container shown and described, the moisture is retained. within the clay for a .relativelyvloiig lperiod and the clay is vthus kept in proper condition for use during such period. v

By the use of a wet sponge the matter being duplicated can be removed from the transfer surface so that' the invention may' be frequently used with very little attention.

Each time the matter being duplicated is removed from the transfer surface, a minute layer of clay is removed from this surface and eventually the transfer surface .will become slightly rough and gritty. This surface may be renewed by spreading over it a small amount of `fresh clay reduced to a plastic condition by the addition of glycerine. Anordinary knife or spatula may be used for this purpose and by reason of the character of the frame ,12, al gage .or guide will be provided for Aengagement by the knife when vleveling the lfresh or renewed transfer surface.

The invention is susceptible of various changes in' its forni, proportions and minor details of-consti'uction and the rightis here`- in reserved to make such changes as properly fall within'the scope of the appended clain'i.

Having described the invention what is claimed is A duplicator comprising in combination a slate including a rectangular frame having .a single centrally located groove about the inner edge thereof, and a slate fitted in said grooves, and a pad reposing upontlie slate and having its outer .surface Hush with the adjacent surface of the frame to provide a transfer surface. i

EGBERT VAN EERDE.k

Intestimony whereof I affix my signature.l 

